// SPECIES PROFILE · SHRUB · NATIVE · CLONAL THICKET

Smooth Sumac

Rhus glabra

The most widely distributed shrub in North America, smooth sumac is the only species native to all 48 contiguous states, and one of the most easily recognized woody plants in NE Oklahoma: a clonal colony-forming shrub of fence rows, roadside cuts, and abandoned fields, with large pinnately compound leaves that turn brilliant scarlet to crimson in October, dense terminal pyramidal panicles of greenish flowers humming with pollinators in early summer, and upright cones of fuzzy red drupes that persist well into winter and yield a tart pink "sumac-ade" beverage rich in vitamin C and tannins.

// QUICK FACTS

Family: Anacardiaceae (cashew family)
Group: Deciduous suckering shrub / small tree
Native range: All 48 contiguous US states; abundant throughout NE Oklahoma
USDA hardiness: Zones 3–9 (Tulsa = 7a/7b)
Mature size: 8–15 ft tall · 10–20+ ft clonal spread
Sun: Full sun (tolerates light shade; flowers/fruits poorly in shade)
Soil: Adaptable; prefers well-drained; tolerates rocky, sandy, dry, alkaline, infertile
Water: Drought-tolerant once established; intolerant of standing water
Bloom: June – July (greenish-yellow panicles)
Fruit: August – persisting through winter (dense red drupes)
Sex expression: Dioecious — only female plants bear fruit
Wildlife value: ~300 documented insect associates; winter food for 30+ bird species
Ecological role: Pioneer / edge / hedgerow · soil-binding clonal colonist

Smooth Sumac (Rhus glabra) — brilliant scarlet fall color and dense upright clusters of red fuzzy drupes — *Rhus glabra*. Photo via Wikipedia / Wikimedia Commons.

Identification

[ field key — glabrous twigs · pinnate leaves · red drupe cones ]

Habit, Bark & Twigs

Smooth sumac forms open clonal colonies of upright stems arising from spreading shallow roots; isolated stems reach 8–15 ft, with the largest individuals in protected ravines occasionally becoming small 20-ft trees. Twigs are stout, with a diagnostic chambered white pith and a milky-yellow sap when broken. Most diagnostic in winter: the twigs are smooth and waxy-glabrous (hairless), with a glaucous bluish bloom that rubs off — the basis for both the species epithet glabra and the common name. Bark on older stems is thin, grayish-brown, and develops shallow horizontal lenticels.

Leaves

Leaves are large, alternate, odd-pinnately compound, 12–24 in long with 11–31 leaflets per leaf. Each leaflet is 2–4 in long, lance-shaped, finely serrate, with a long-pointed tip and a slightly asymmetric base. The upper surface is dark green and glabrous; the lower surface is conspicuously whitish-glaucous — a key diagnostic feature when you flip a leaflet over. The leaf rachis is round in cross-section (not winged), hairless, and often reddish. Fall color in NE Oklahoma is brilliant scarlet to deep crimson in early-to-mid October — among the most reliable and intense fall color of any regional native shrub.

Flowers & Fruit

Dioecious — individual plants bear either male or female flowers, never both. Flowers are small, greenish-yellow to cream, in dense erect terminal panicles 4–10 in tall, blooming June–July. Female panicles develop into the iconic upright pyramidal cone of dense red, finely-hairy drupes, each drupe ~4 mm across, ripening in August and persisting on the plant through winter. The fuzzy hairs on the drupes are densely coated with malic acid — the source of the tart "sumac-ade" lemon-like flavor.

Confusables

Three other regional Anacardiaceae are routinely confused with smooth sumac:

Staghorn sumac (Rhus typhina): very similar in form and fruit; distinguished by densely velvety-hairy young twigs resembling deer antlers in velvet. Marginal in NE Oklahoma; introduced in plantings.
Winged / shining sumac (Rhus copallinum): leaf rachis is conspicuously winged between leaflets; fewer leaflets; common on dry uplands across NE OK.
Poison sumac (Toxicodendron vernix): a wetland species with white drooping fruit clusters (not red, not erect) and no serrate leaflets; not common in NE OK and easily distinguished by white drupes alone — if the fruit is red and upright, it is safe to handle.

Habitat & Range in NE Oklahoma

Smooth sumac is everywhere in NE Oklahoma: along every county road, on every fenceline, on cleared and recovering oilfield lots, on highway-cut slopes, on the margins of every cattle pasture, in every old field transitioning to woody cover, and on the sunny edges of every Cross Timbers woodland. It is one of the most aggressive woody pioneer species in the region and is the dominant clonal shrub of disturbed-edge habitats throughout Tulsa, Wagoner, Rogers, and Mayes counties. It also occurs as scattered open- grown individuals in tallgrass prairie and open oak savanna where periodic fire historically kept woody cover in check.

The species is essentially soil-indifferent — it grows on the rocky chert ridges of the western Cross Timbers, on the alkaline limestone soils of the Osage Hills, on the sandy soils of the Arkansas River bottoms, and on the heavy red clay subsoils exposed by construction throughout the Tulsa metro. The two requirements it cannot do without are full sun and good drainage: it is intolerant of deep shade (it disappears from a closing oak-hickory canopy within a few decades) and intolerant of standing water. Wildfire and prescribed burn top-kill the above-ground stems but stimulate vigorous resprouting from the spreading root system, so sumac thickets often expand following fire.

Ecology & Wildlife Value

[ pollinators · birds · mammals · soil ]

Pollinators & insects

Sumac panicles in June and early July are among the most densely-visited flowers of any regional native shrub. Documented visitors include native bees in the genera Andrena and Lasioglossum, honey bees, syrphid flies, soldier beetles, longhorned beetles, paper wasps, hoverflies, and many more. Sumac is a minor but useful nectar/pollen source during the early-summer pollinator-floral gap between spring tree bloom and late-summer prairie forb bloom. Rhus glabra is also documented as larval host for several lepidoptera, including the red-banded hairstreak (Calycopis cecrops) and various luna and underwing moths.

Birds & mammals

The fruit drupe clusters are an important winter starvation food for at least 30 bird species in NE Oklahoma, including eastern bluebird, northern cardinal, robin, mockingbird, brown thrasher, cedar waxwing, downy and red-bellied woodpecker, ruffed grouse, wild turkey, and bobwhite quail. Drupes are low in fat and high in tannins — not a preferred food, but they remain on the plant when little else does, making them a critical late-winter resource. Cottontail and white-tailed deer browse twigs and bark in winter; small mammals nest in the dense thicket cover.

Hedgerow & succession

Sumac is a defining species of the old-field-to-woodland successional sere in NE Oklahoma. After cropland or pasture abandonment, sumac and persimmon (Diospyros virginiana) are typically the first woody species to colonize, forming dense clonal thickets within 5–15 years. Under continued protection from fire and grazing, oak and hickory eventually overtop sumac and shade it out over 30–60 years. The transient sumac thicket stage is critically important habitat for shrubland-dependent birds (yellow-breasted chat, bell's vireo, brown thrasher, field sparrow) that have declined as midwestern field-edge habitat has been lost.

Soil & site recovery

The dense fibrous root system of clonal sumac stands is unusually effective at stabilizing eroding slopes — road cuts, washouts, and reclaimed strip-mine spoils across eastern Oklahoma are commonly stabilized by spontaneous sumac colonies within a decade. The leaf litter is moderately rich in tannins and decomposes more slowly than oak; sumac is not a major soil-building species, but the closed canopy of an established thicket suppresses bare-soil conditions and initiates soil recovery on extremely degraded sites where almost nothing else will grow.

Sumac is NOT poison ivy / poison oak / poison sumac: Rhus glabra, R. copallinum, and R. typhina are all safe to handle and yield edible drupes. The toxic urushiol-bearing members of Anacardiaceae are now placed in the separate genus Toxicodendron: poison ivy (T. radicans), poison oak (T. pubescens), and poison sumac (T. vernix). The reliable field rule: red, upright, dry fruit cluster = edible Rhus; white, drooping, waxy fruit = toxic Toxicodendron.

Clonal aggression: Smooth sumac is one of the more aggressive clonal shrubs in regional plantings. A single plant can spread 15–20+ ft in a decade via root suckers, and excavating an established colony is difficult. Site it where its spread is welcome (hedgerow, naturalized edge, erosion control, screening), or contain it with mowing, root barriers, or annual cutting of suckers.

Horticulture & Care

[ siting · planting · pruning · suckers ]

When to plant intentionally

Smooth sumac is a strong choice for hedgerows, wildlife screens, naturalized edges, erosion control on dry slopes, large pollinator plantings, and any site where its scarlet October color and persistent winter fruit structure are valued. It is excellent for the back of a large naturalized planting, for a property-line wildlife hedge, for screening a chain-link fence, and for stabilizing the rocky cut slope of a residential site on the Osage Hills uplands. Avoid in small formal gardens, in plantings where suckering will require continuous management, or where the milky sap and tannic leaf litter will reach an immaculately maintained turf.

Planting

Season: bare-root in late winter (February–March); container plants any time the ground is workable.
Spacing: 6–10 ft on-center for an intentionally dense hedgerow; isolated plants will fill in via suckers.
Sex consideration: for fruit and full wildlife/edible value, plant at least one named female cultivar; nursery stock is rarely sex-labeled, so plant several or buy from a specialty native nursery that sex-labels.
Hole: twice the root ball width; plant at the same depth as the root flare.
Mulch: shredded-leaf or wood-chip mulch out to the drip line; do not pile against the stem.
Water: deep weekly through the first growing season; no supplemental water needed thereafter.

Pruning & managing the colony

Sumac responds vigorously to cutting. To maintain a tidy hedgerow form, you can cut the entire colony to the ground every 3–5 years in late winter (called "coppicing") — the colony will resprout 4–6 ft in a single season. To maintain a single-trunked small-tree form on a particularly handsome individual, remove all suckers annually each summer at ground level with loppers. To prevent further spread of an established colony, cut new suckers as they appear at the colony perimeter; root-barrier (24–36 in deep) is more permanent and will be needed if turf or beds adjoin.

Cultivars

Cultivar	Origin / Distinguishing feature	Notes for Tulsa
'Laciniata' (cutleaf smooth sumac)	Cut/dissected leaflets giving a fern-like texture; bright fall color	Most ornamental form; widely available; smaller stature 6–10 ft.
Native straight species (preferred for restoration)	Wild-collected from regional remnants	Best for hedgerow, wildlife, and full ecological function.
'Morden Selection'	Canadian Prairie selection, extra-cold-hardy, dense panicles	Performs well in OK; reliably fruits.

Cultural & Material Uses

Smooth sumac has one of the longest documented Indigenous-use records of any North American plant. Anthropologists have documented uses by at least 45 Indigenous nations (Cherokee, Choctaw, Creek/Muscogee, Seminole, Osage, Comanche, and many more), all of whom are present in or have historic ties to NE Oklahoma. Modern foraging continues these traditions.

Sumac-ade ("Indian lemonade"): The single most widespread traditional use. Ripe red drupe clusters are gathered on a dry day before rain has washed off the malic-acid-coated hairs, agitated in cold water, strained through a cloth (essential — the hairs are irritating), sweetened with honey or maple sugar, and chilled. The result is a tart pink lemon-like beverage, rich in vitamin C, traditionally drunk in late summer and fall. Use cold water only — hot water extracts bitter tannins.
Sumac spice: Drupes are dried and ground, then sieved to separate the tart red coating from the inedible seed. The resulting tart-fruity powder is the genus base of the Middle Eastern spice sumac (commercial product is usually R. coriaria); North American R. glabra drupes can substitute and have been used as a seasoning by foragers and historic Indigenous communities.
Smoking mixture (kinnikinnick): The dried leaves of smooth sumac were a major component of traditional Indigenous smoking blends used ceremonially across the Plains and Eastern Woodlands — mixed with tobacco, bearberry, red-osier dogwood inner bark, and other species. Among the Osage and other regional nations, sumac was a routine constituent.
Tannin source: The bark, leaves, and especially the gall growths on smooth sumac are very high in tannins (12–25% by dry weight) and were used historically for tanning leather and as an astringent medicinal preparation. Sumac tannins are still occasionally used in small-batch traditional tanning operations.
Dye plant: Bark and twigs yield a yellow to tan dye for wool and basketry; ground drupes yield a deeper rust-red dye with appropriate mordants.
Medicinal: Cherokee, Choctaw, and Creek pharmacopeias document use of bark and root preparations as astringents for diarrhea, gargles for sore throat, and topical washes — all consistent with the high tannin content. Modern herbal use is limited and these preparations require care given concentrated tannins.
Culinary modern uses: Forager-chefs use the strained sumac concentrate as a souring agent in dressings, marinades, sorbets, and cocktails — analogous to lemon or vinegar. The Tulsa and OKC forager community considers R. glabra drupes a flagship local ingredient.
Wildlife forage / bee plant: Recognized in regional pollinator and wildlife horticultural literature as a high-value plant for early-summer pollinator nectar and for late-winter bird food.

Sources & Further Reading

USDA NRCS PLANTS Database — Rhus glabra: plants.usda.gov/plant-profile/RHGL
USDA Forest Service Fire Effects Information System (FEIS) — Rhus glabra: fs.usda.gov/database/feis/plants/shrub/rhugla
Lady Bird Johnson Wildflower Center — Rhus glabra: wildflower.org — RHGL
Missouri Botanical Garden — Rhus glabra: missouribotanicalgarden.org — Rhus glabra
Native American Ethnobotany Database (Daniel Moerman, U. Michigan-Dearborn) — Rhus glabra: naeb.brit.org — Rhus glabra
Oklahoma Biological Survey — Atlas of Oklahoma vascular flora, Rhus glabra records.
Foster, S. & Duke, J.A. (2014), Peterson Field Guide to Medicinal Plants & Herbs of Eastern and Central North America — sumac entry.
Kindscher, K. (1987), Edible Wild Plants of the Prairie: An Ethnobotanical Guide (University Press of Kansas) — sumac chapter, sumac-ade preparation.
Thayer, S. (2010), Nature's Garden: A Guide to Identifying, Harvesting, and Preparing Edible Wild Plants — smooth sumac chapter.
Wikipedia — Rhus glabra: en.wikipedia.org/wiki/Rhus_glabra
Tallamy, D.W. & Shropshire, K.J. (2009), "Ranking lepidopteran use of native versus introduced plants," Conservation Biology — Rhus as moderate-value Lepidoptera host genus.

Smooth Sumac

Identification

Habit, Bark & Twigs

Leaves

Flowers & Fruit

Confusables

Habitat & Range in NE Oklahoma

Ecology & Wildlife Value

Pollinators & insects

Birds & mammals

Hedgerow & succession

Soil & site recovery

Horticulture & Care

When to plant intentionally

Planting

Pruning & managing the colony

Cultivars

Cultural & Material Uses

Sources & Further Reading

Companion Planting